In cellular respiration, what is the role of oxygen in the respiratory pathway?

What is the rock cycle and how does it explain the variations of rocks found on earth?

Which statements describe Earth? Select three options. It is an outer planet. It is a terrestrial planet. It was formed from gas and dust. It has a thick atmosphere of hydrogen and helium. It was formed in a debris disk from colliding planetesimals.

Dizygotic twins: a. are also called "identical" twins. b. develop from the same fertilized egg. c. are as genetically similar as other siblings. d. are genetically more simlar than other siblings.

Describe two serious threats to our supply of groundwater.

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Which of the following accurately describes the angiosperm plant life cycle? A. The ovule develops into an anther. B. The anther produces eggs. C. The embryo develops into a seedling. D. The ovary is haploid.

Which resource is a nonrenewable resource? fresh water maple trees solar energy precious metal

The trace or remains of an organism that lived ago, most commonly preserved in sedimentary rock?

Usually flowers contain more stamens than pistil. Why?

Choose all the answers that apply. Water: 1. can dissolve most substances 2. has a strong attraction to itself 3. is neither acidic nor basic 4. contracts when it freezes 5. heats up and cools down more quickly than land